Thermally-actuated motive device



I Marcia 8, 1952.. c. SCOTT-SNELL ET AL 1,848,226

THERMALLY ACTUATED MOTIVE DEVICE Filed Jan. 11. 1930 {NWSN 7-1415Patented: Mar; ,8,' 1932 J r0 INTERNATIONAL VACUUM POWER,Lnv rrEnpnLonon,- n1 eLAivn V rHEnMALLY-AcrnA'rEn moms nn vicn ApplicationfiledJanuary 11', 1930, Serial No. 420,265, and in GreatBritain January 12,1929.

This invention relates to thermally actuated motive devices wherein heatis continuously supplied to a vaporgenerator which is in communicationby way of suitable valves,

with an inlet and, an outlet duct communicating respectively with asupply of liquid and with apparatus to which it is desired to convey thesaid liquid, a pressureor velocity head being produced in the liquid byautomatic action.

Examples of such'devices are included in ;United States'specificationNo. 1,7 7 3,55 1; VWe

have found that when such devices areapplied in practice in connectionwith the feed ingot oil under pressure to oil nozzles-there is a limitto the pressure which canbe derived from thesystem amounting to about orlb. per square inch. In some cases it i i is desirable to employ higherdelivery pressures and the object of the present invention .isto providemeans forthe attainment of such a pressures.

The attached diagrammatic figure illustrates one. convenient mode ofcarrying the present invention into eifect. According to this figure weprovide avapor generator m which is closed at its lower end and bentover I area as compared with that of the U-tube m,

to form a U-tube, the other limb a of which is connected to a verticalconduit 30,theupper end 20 ofwhich is connected by way of an uptake pipe'0 of small cross-sectional n to the vapor generator m, the connectionof the latter being at a point'somewhat below the upper end thereof.-The upper end 20 of the vertical pipe is also "connected by a pipe 31with the upper end ota-further vertical pipe p, the lowerend of whichisconnected by way of a'duct 21 with thepipe 30 as shown. The lower endof the pipe ;0 isturnished with 'a non-return inlet valve 32, while theupper end of thispipe p is furnishedwith a nonreturn delivery valve 33;

Thevapor generator-1s furnished with a strip 15 of heat-conductingmaterial such as brass which is intended to restcontinuously I f in aflame or other source of heat,

In operation, so long as heat is continu- 7 Q ously supplied to the tubem by way of the strip 15 a recurring cycle isprodu'ced as folture of theliquid in the generator m. When condensation ofthe vapor risingthrough'the "oneness scornsnnnnnnn EDWARD sco'rr-siinnnfor neuron,nnenhnnjiissienons;

lows :Vapor is generated into the generator I a m and at the same timeliquid is delivered 1 past the valve 33 and after a time interval isejected through the tube 0; The vapor,

however, beforev it reaches the tube 19 for condensation is caused totravel by way of the upper end 20 of the tube 30;"the slight delayoccasioned thereby being sulficient to ensure substantial uniformity ofthe temperapipes 0 and 31 does take'place none ofthe l1qu1d in the pipe'm'is of such a high tem's perature as will enable itto-boil and thusthe full effect of the pressure drop resulting from, condensation isutilized in drawing in I i fresh liquid past the valve 32.

It willbe appreciated thatbefore heat is supplied to the strip 15Itheapparatus is com- Having now described our invention what we claim asnew and deslre to secure by Letters Patent is 1. 'A thermally actuatedmotive device including a liquid-containing conduit, a non-'. returndeliveryvalve at thetop thereof,a-

non-return admission valve at the bottom thereof, a continuously heatedinverted U- shaped conduit, the open end of one limb of which isconnected to said former conduit at a point adjacent its lower end andabove said delaychamber and between said latter cham-e her and a pointadjacent said upper end of the first-mentioned conduit and .belowsaidvalve.

2; A thermally actuated device as claimed i in claim 1wherein'said'condensation delay chamber comprises a tubular space forthe retention of vapor after its ejection fromi.

said inverted U-shaped conduit and prior to 5 its condensation. r p

3. IA thermally actu ted device as claimed in claim 1 wherein saidcondensation delay chamber is disposed in heat exchange relationshipwith the smaller bore conduit connected to the U-shaped conduit wherebysaid condensation delay chamber is maintained sufliciently hot topreclude immediate condensatiou by heat derived fromvapor ascendinthrough said small bore conduit. I V V n testimony whereof We havesigned our names to this specification;

CHARLES SCOTT-SNELL. EDWARD SCOTT-SNELL.

